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C2851-H-VSEC/K9
2851H.Perf.VSEC:AIM-VPN2/SSL,PVDM2,CCME/SRST,AIS,256F/512D
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C2851-H-VSEC/K9 is a fixed architecture enterprise router engineered with redundant AC power options and dual WAN configuration, featuring 10/100 Ethernet interfaces that deliver reliable wired connectivity. It offers integrated voice services and robust firewall security, ensuring high throughput performance of approximately 0.085 Gbps for demanding network environments.
C2851-H-VSEC/K9 supports modular expansion via two EHWIC slots and implements VPN features including IPSec and SSL VPN to secure branch connectivity. Designed for enterprise use, it provides high availability, QoS capabilities, and comprehensive remote management support, making it ideally suited for businesses that require secure, integrated services without compromise.
C2851-H-VSEC/K9 price is $5,038.00, a 54.6% saving from the Cisco list price of $11,095.00. C2851-H-VSEC/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for C2851-H-VSEC/K9 for additional pricing. Browse the full Router Isr 2800 series or explore all Cisco products.
In a nationwide retail chain, deploying the Cisco 2851-H-VSEC (AIM-VPN2/SSL, 256F/512D) establishes resilient, hardware-accelerated IPsec tunnels (up to 100 Mbps) between headquarters and 50+ branches. Result: end-to-end data encryption with <1 ms latency overhead, centralized policy enforcement, and 99.99% uptime across distributed locations.
A financial services firm equips mobile consultants with SSL VPN connectivity via the Cisco 2851-H-VSEC’s AIM-VPN2/SSL module. Outcome: on-demand, clientless access to corporate intranet and VoIP resources with multi-factor authentication, delivering 256-bit encryption and granular session control, boosting remote productivity by 40% while maintaining regulatory compliance.
A healthcare network leverages the 2851-H-VSEC’s PVDM2 DSP cards, CCME and SRST capabilities to host local call processing at 20 clinics. Benefit: uninterrupted IP telephony during WAN outages, seamless failover in <5 seconds, crystal-clear voice quality, and consolidated management that cuts operational costs by 30%.
To get the detailed certification, please go to the Compliance Center.
| C2851-H-VSEC/K9 |  CISCO2811-SRST/K9 |  C2801-SHDSL-V3/K9 |  C2821-VSEC-CUBE/K9 |  CISCO2801-ADSL2/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Modular | Modular | Modular | Modular |
| Broadband | N/A | N/A | DSL | N/A | DSL |
| Built-in Security Features | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection | Firewall, Intrusion Prevention, VPN Encryption | Firewall / Intrusion Prevention / IPSec | Firewall / Intrusion Prevention |
| Compliance Standards | FCC / CE / RoHS | FCC / CE | FCC, CE | FCC, CE, UL | FCC / CE / RoHS |
| Connectivity Type | Wired | Wired | Wired | Wired | Wired |
| Depth | N/A | 14.96 inches | N/A | N/A | 12.76 in |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | N/A | N/A | N/A | N/A |
| Ethernet Technology | 10/100 | 10/100 | 10/100 | 10/100 | 10/100 |
| Expansion Slots | EHWIC | NIM | NIM | EHWIC / NIM | EHWIC |
| Features | VPN / VoIP / IPv6 Compatible / Firewall | VPN / IPv6 Compatible / Firewall | VPN, Firewall, NAT, QoS, Integrated Services | VPN / Firewall / NAT / DMVPN / IPv6 Compatible | VPN / Voice / Firewall / IPv6 Compatible |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 128 MB | 128 MB | 256 MB | 128 MB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount / Desktop | Desktop | Rack-mount |
| Height | N/A | 1.72 inches | N/A | N/A | 1.73 in |
| High Availability Support | Supported | Supported | Supported | Supported | Not Supported |
| Integrated Services | Voice | Voice / Video / WAN Optimization | Voice, VPN, Routing | Voice / Video / Security | Voice / Data / Security |
| Interface Ports | RJ-45 | RJ-45 | RJ-45, Optional SFP | RJ-45 | RJ-45 |
| LAN Ports | N/A | 2 LAN Ports | 2 LAN Ports | 2 LAN Ports | 2 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 512 MB | 256 MB | 256 MB | 256 MB | 256 MB |
| Modular Slots Available | 2 Slots | 2 Slots | 2 Slots | 2 Slots | 2 Slots |
| Network Protocols | IPv4 / IPv6 | IPv4 / IPv6 | IP, TCP, UDP, ICMP | IP, IPX, AppleTalk, Frame Relay | IPv4 / IPv6 |
| Power | 140W | 80W | 65 Watts | 60 Watts | 210 W |
| Power Source | AC Power Supply / Redundant | AC Power Supply / Redundant | AC Power Supply | AC Power Supply / Redundant | AC Power Supply |
| Product Name | Cisco 2851-H-VSEC/K9 | CISCO2811-SRST/K9 | Cisco 2801-SHDSL-V3/K9 Integrated Services Router | Cisco C2821-VSEC-CUBE/K9 | CISCO2801-ADSL2/K9 |
| Product Type | Enterprise Router | Enterprise Router | Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | SSH / Telnet / SNMP | SSH / Telnet / SNMP | Telnet, SSH, SNMP | SSH, Telnet, SNMP | Telnet / SSH / SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing |
| Safety | N/A | N/A | N/A | N/A | N/A |
| Speed/Capacity | N/A | N/A | Fast Ethernet | Fast Ethernet | 10/100 |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 0.085 Gbps | 0.025 Gbps | 25 Mbps | 0.03 Gbps | 25 Mbps |
| Use Case | Enterprise | Enterprise / Small Business | Enterprise | Enterprise / Branch Office | Enterprise / Business |
| VPN Support | IPSec / SSL VPN / DMVPN | IPSec | IPSec / SSL VPN | IPSec / SSL VPN / DMVPN | IPSec |
| WAN Configuration | Dual WAN | Dual WAN | Dual WAN | Dual WAN | WAN |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | 2 WAN | 1 WAN |
| Weight | N/A | 21.52 lbs | N/A | N/A | 13.2 lbs |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | N/A |
| Width | N/A | 17.24 inches | N/A | N/A | 17.52 in |
| Wireless Support | No | No | No | No | No |
Cisco 2851H VSEC delivers reliable VPN/SSL and secure UC. PVDM2 with CCME/SRST ensures stable voice and data communications for medium branch offices.
Durable and efficient. Handles multiple endpoints with advanced security while maintaining predictable voice and UC performance.
Easy to deploy and manage. Provides seamless secure communications and reliable UC operations across branches.
High-performing and robust. Maintains stable VPN, voice, and data connections across multiple endpoints.
Reliable Cisco solution. Ideal for medium branches requiring secure UC and predictable voice performance.
The Cisco 2851-H-VSEC/K9 is a high-performance branch router offering hardware-accelerated AIM-VPN2/SSL encryption, dual PVDM2 DSP slots for voice processing, CCME with SRST for call resiliency, AIS application inspection, and a forwarding rate of 256 kpps with 512 MB DRAM.
AIM-VPN2/SSL provides hardware-based IPsec and SSL VPN acceleration, enabling up to 180 Mbps of encrypted throughput and secure remote access with minimal CPU overhead.
PVDM2 is Cisco’s DSP module family for voice and conferencing. The 2851 includes two PVDM2 slots, each supporting up to 30 G.711 or 16 G.729 calls, for a total of 60 G.711 or 32 G.729 simultaneous voice channels.
Cisco CallManager Express (CCME) with Survivable Remote Site Telephony (SRST) allows the 2851 to host call processing locally and automatically fail over during WAN outages, maintaining dial-tone and call routing.
AIS (Application Inspection Services) enables deep packet inspection for HTTP, SIP, FTP and other protocols, improving security and application performance through real-time traffic analysis.
256F indicates a forwarding capacity of 256 kpps (thousand packets per second), while 512D denotes 512 MB of DRAM for large routing tables, multiple services, and high session counts.
With the AIM-VPN2/SSL license, the 2851 supports up to 1000 site-to-site IPsec VPN tunnels and 500 concurrent SSL VPN sessions, subject to available memory and CPU resources.
The router delivers up to 90 Mbps of sustained routing throughput and up to 65 Mbps of encrypted VPN performance under typical branch-office loads.
This router excels in medium-sized branch offices, retail sites, and enterprise PoPs requiring integrated voice, video, security and high-performance VPN services.
Yes. The 2851 features two hot-swappable AC power supply bays for N+1 redundancy, ensuring continuous operation during a power supply failure.
You can expand DRAM up to 512 MB, add 256 MB to 2 GB of flash storage, and populate both PVDM2 DSP slots and four integrated network module bays for interface flexibility.
It includes firewall services, IPS via NME modules, application inspection (AIS), advanced ACLs, IPsec/SSL VPN, NBAR, and control-plane policing for a comprehensive security posture.
Compared with the 2801, the 2851 offers higher packet forwarding (256 kpps vs. 160 kpps), more DRAM, additional service-module slots, integrated hardware VPN acceleration, and dual PVDM2 capabilities.
Cisco provides a one-year limited hardware warranty. Optional SMARTnet contracts offer 24×7 support, software updates, and next-business-day hardware replacement.
Yes. It is a 1 RU device measuring 43.5 cm (W) × 33.0 cm (D) × 4.4 cm (H) and weighs approximately 4.5 kg, fitting standard 19-inch racks.
Typical power consumption is 90 W (up to 150 W max). It meets RoHS, WEEE, and NEBS Level 3 standards for energy efficiency and operational reliability.